172911709189 has 2 divisors, whose sum is σ = 172911709190. Its totient is φ = 172911709188.

The previous prime is 172911709183. The next prime is 172911709211. The reversal of 172911709189 is 981907119271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113208696225 + 59703012964 = 336465^2 + 244342^2 .

It is a cyclic number.

It is not a de Polignac number, because 172911709189 - 2³ = 172911709181 is a prime.

It is a super-2 number, since 2×172911709189² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172911709181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86455854594 + 86455854595.

It is an arithmetic number, because the mean of its divisors is an integer number (86455854595).

Almost surely, 2^172911709189 is an apocalyptic number.

It is an amenable number.

172911709189 is a deficient number, since it is larger than the sum of its proper divisors (1).

172911709189 is an equidigital number, since it uses as much as digits as its factorization.

172911709189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 55.

The spelling of 172911709189 in words is "one hundred seventy-two billion, nine hundred eleven million, seven hundred nine thousand, one hundred eighty-nine".